Gearing
Thread Starter
|
New User
Joined: Apr 2021
Posts: 6
Likes: 0
Gearing
I'm sure this topic has been discussed at length but I wasn't able to find what I was looking for.
What I'm trying to fix is the truck seeming gutless. I know these trucks aren't the quickest but it can't get out of its own way empty. It was my father in laws truck and I'm playing catch up on some things.
The truck's bio is it's a 92 F350 with the 7.3 IDI and about 290,000 miles on it. A rebuilt E4OD transmission and stock axles I believe it's a 10.25 rear and Dana 60 front wit stock 4:10 gears. I've upgraded to an electric fuel pump, a gear reduction starter from DB electrical and SD front suspension which gave me enough lift to run military 37's.
This truck really isn't a daily driver but when driven does see speed up to 70 mph. So my question how much improvement could I expect with going to a 4:56 gear and would 4:88 be to much? I have no intention of adding a turbo or any other power mods. The truck just seems like it needs to be geared down but I have no experience with making those sort of changes.
What I'm trying to fix is the truck seeming gutless. I know these trucks aren't the quickest but it can't get out of its own way empty. It was my father in laws truck and I'm playing catch up on some things.
The truck's bio is it's a 92 F350 with the 7.3 IDI and about 290,000 miles on it. A rebuilt E4OD transmission and stock axles I believe it's a 10.25 rear and Dana 60 front wit stock 4:10 gears. I've upgraded to an electric fuel pump, a gear reduction starter from DB electrical and SD front suspension which gave me enough lift to run military 37's.
This truck really isn't a daily driver but when driven does see speed up to 70 mph. So my question how much improvement could I expect with going to a 4:56 gear and would 4:88 be to much? I have no intention of adding a turbo or any other power mods. The truck just seems like it needs to be geared down but I have no experience with making those sort of changes.
i ain't rite
Joined: Mar 2005
Posts: 65,565
Likes: 5,601
From: Marlboro Mental Hospital.
4:56 or 4:88 gears will make 70mph your top speed bouncing on the rev limiter.
i have 4:10 gears with 37 inch tires and a C6 trans. and it is all i can do to hit 70 going downhill.
i have 4:10 gears with 37 inch tires and a C6 trans. and it is all i can do to hit 70 going downhill.
Thread Starter
|
New User
Joined: Apr 2021
Posts: 6
Likes: 0
I think 4:88's will be too much but the 4:56's will give me the bottom end I'm hoping for. I'm sure the injection pump is contributing to the lack of power. I know these trucks aren't powerhouses but mine seems excessively under powered.
Thread Starter
|
New User
Joined: Apr 2021
Posts: 6
Likes: 0
I do plan on replacing the injection pump before the gears if that gets the performance where I'm happy with it I'll leave the gears alone. But since I decided I'm going to just restore the truck, I'm trying to plan one step ahead of where I'm at. The transmission is done, the electrical as far as batteries and starter are done. Injection pump, injectors and fuel lines are next. After that I'm going to the axles replacing bearings, seals, brakes etc... figured since I'll be in there now is the time to start learning about pros and cons to choice in gear ratios.
Logistics Pro
Joined: May 2017
Posts: 3,523
Likes: 483
From: Southern OH
Where did you come up with that info? The OP has an E40D transmission with a .71 overdrive, with 37 inch tires that puts him at about 2100 RPM at 70 mph with 4.56 gears and 2250 RPM with 4.88 gears, either way not even close to the rev limit.
i ain't rite
Joined: Mar 2005
Posts: 65,565
Likes: 5,601
From: Marlboro Mental Hospital.
real life. with overdrive the same truck had a top speed of around 85 mph.
without overdrive it tops out around 70.
raising gear ratio will be about the same as removing overdrive.
without overdrive it tops out around 70.
raising gear ratio will be about the same as removing overdrive.
Trending Topics
Cross-Country
Joined: Aug 2020
Posts: 68
Likes: 7
I have 37 A/T with 4:10 and the ZF5 and get up to 80+ pretty easy even on a 2% without going too high in revs. I try to keep it under 3k though
I can do slightly better in my DRW because better aero and the tires
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Posting Guru
Joined: Oct 2005
Posts: 2,282
Likes: 4
From: Oregon
I wouldn't go over 4.10s. Look at freshening the fuel system up and down the line a turbo if you want to wake it up. Ever had the timing set correctly? Good IP, injectors and timing and a NA with 4.10s and 37s will get up and go.
i ain't rite
Joined: Mar 2005
Posts: 65,565
Likes: 5,601
From: Marlboro Mental Hospital.
i said with a C-6 trans it is hard to see 70. .
and i also said with the ZF-5 the same truck would do 85
Thread
Thread Starter
Forum
Replies
Last Post
Nevergetstuck
1987 - 1996 F150 & Larger F-Series Trucks
13
Feb 25, 2013 09:08 PM